Metallic packing.



UNITED STATES PATENT OFFICE.

ROSCOE HILTON ALDRICH. OF-ALLENTOWN, PENNSYLVANIA, ASSIGNOR TO THE i -ALDRICH PUMP COMPANY, OF ALLENTOWN, PENNSYLVANIA.

METALLIC PACKING.

My invention relates to metallic packing,-

and has -reference more particularly to a yield-ablemetallic ring tor the packing. j The ob ect of the invention ,is to provide a, simple, inexpensive and efiicient metallic packing which is-charm-terized by the "provision of a metallic, 'yieldable ring which carries a resilient member adapted to contract the metallic ring when pressure is applied to said metallic ring.

\Vith the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists in'the novel construction, combination and arrangement of parts as herein fully described, illustrated and claimed.

In the accompanying drawings, forming part of the application, similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a section through a pump casing provided with an embodiment of my invention; Fig. 2 is a sectional view through one of the packing rings; Fig. 3 is a similar section through a fragment thereof, showing the same under pressure: Fig. 4 is a plan view of the ring; and Fig. 5 shows means for removing the ring section at the stufiing box.

fore proceeding to a more detailed detion of my invention it must be clearly understood that although the metallic parking' herein disclosed is desigied for use with pump plungers, said packing can be as eliiciently utilized for other purposes of similar nature.

Referring to the drawings, 6 represents a ring which is formed of two semi-circular segments 7, the contacting ends of the segments forming a perfect joint. The diameter of the ring so formed is substantiall the same as the diameter of the plunger 8 it is to lit. Each of the rings 6 has an exteriorgzumular groove 9, which is preterahlv rectangular in cross section, as best seen in Figs. 1 to 3. It has also an interior, annular notch 10, V-shaperl in cross section,

Specification of Letters Patent.

of the two sections.

Patented Jan. 11, 1916.

Application filed A iril 30, 1915. Serial No. 24,885.

which is central with respect to the groove 9 and is in the middle of the ring 6 formed Each end surface of the ring 6 has a central depression 11 resulting in. a marginal projection 12 which constitutes the compression lip of the ring, as will appear hereinafter. Y Engaging the grooves 9 of the halves 7 of the ring is a rubber ring 13. This rubber ring constitutes the resilient member for the metallic ring and causes the metallic ring to grip the plunger 8 when pressure is applied to the marginal projections 12. The metallic ring being formed of lead or composition is very pliable. Furthermore, due to the provision of the notch 10, said ring is rendered yieldable, that is to say the ring will bend at the notch when pressure is applied to the marginal projections 12. This bending of the ring will cause the inner face of the ring to be slightly curved or bulged'as shown in Fig. 3 of the drawing. The pressure on the marginal projections 12 also causes a contraction of the groove compressing the rubber ring 13, which in turn forces the metallic ring against the plunger and continues to force the same until saidrubber ring expands to its normal condition. It will be noted that the bending of the ring slightly reduces the internal diameter of the ring at its middle, so that it is made to tightly contact with the plunger.

Pressure to the packing rings (3 can be applied in any suitable way. of which one way is shown in Fig. 1. In this structure a number of superimposed packing rings 6 are provided within a stufling box 14. The number of packing rings will vary in accordance with the conditions. The lowermostring engages a bushing 15 with its marginal projection 12; while the uppermost ring 6 engages with its marginal projection a ring 16 which is in turn in engagement with a stufiing gland 1'7. The successive rings contact with each other through the medium of their marginal projections 12. \Vhen pressure is applied to the gland 17 by means of the screws, the same is transmitted to the projections 12. The rings being yieldzible will be bent and the rubber ring compressed as before described. These rubber abut with their exterior lateral st against the wall of: the stullii box. and. w their interior surface against the rim of n groove of the r ngs. causing the ring to g ip the plunger as the resistance ofthe ring is less than that of the material forming the -.-stuifing box. Due to the resilience of .the

ring 6 on the though the pressure on the marginal projecrubber rings thegrip action of themetal plunger 8 is maintained, al-

, tions 12 of the rings 6 is graduallydecreaswing due to the wear caused by the reciproca-.

tion of the plunger within the rings. The notch 10, in addition to creating a point of minimum resistance in the ring sections serves as a packing groove base, as any lubricant located within said groove 10 will form a packing.

While I have described the principle of operation, together with the device which I 1 now "consider to" be the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative and that such changes, may be made as are within the scope ofthe I claim: A metallic packing, consisting "appended claim.

copies of mu patent may'f-bc obtained for live cents each, by addres Washlngton,D. G.

of a metal- I lic ring. rectangular in cross section and formed of two semi-circular sections having squareabutting ends, straight inner'face,'a-.V-shaped notchin said innerface, a rectangular gmov in its periphery, a central depressi-on in each side, and an annular rib on each: side at vthe periphery of the ring and bounding the-depression, and a rubber ring in the rectangular groove of the ring, whereby when presring the inner face of said ring will be renthe ring having a" sure is applied to the ribs of the metallic dered convex and' the rubber ring com-' sing the Commissioner of Patents, 

